<template>
<div>
    <router-link tag="div" to="/" class="header-abs" v-show="showAbs">
        <div class="iconfont header-abs-back">&#xe624;</div>
    </router-link>
    <div class="header-fixed" v-show="!showAbs" :style="opacityStyle">
         <router-link tag="div" to="/" class="iconfont header-fixed-back">&#xe624;</router-link>
        景点详情
    </div>
</div>
</template>

<script type="text/ecmascript-6">
export default {
    name:'detailHeader',
    data () {
       return {
           showAbs:true,
           opacityStyle:{
               opacity:0
           }
        }
    },
    props: {

    },
    components: {
        
    },
    methods:{
        handleScroll(){
            console.log(33)
            const top = document.documentElement.scrollTop
            if(top >60 ){
                let opacity = top/140
                opacity = opacity > 1 ? 1 :opacity
                this.opacityStyle = {opacity}
                this.showAbs = false
            }else{
                this.showAbs = true
            }
            console.log(document.documentElement.scrollTop)
        }
    },
    mounted(){
        window.addEventListener('scroll', this.handleScroll)
    },
    beforeDestroy(){
        window.removeEventListener('scroll', this.handleScroll)
    }
    // activated(){
    //     window.addEventListener('scroll', this.handleScroll)
    // },
    // // 全局事件解绑
    // // 页面即将被隐藏或被替换成新页面的时候
    // deactivated(){
    //     window.removeEventListener('scroll', this.handleScroll)
    // }

}
</script>

<style lang="stylus" scoped>
    @import '~styles/varibles.styl'
    .header-abs
        position:absolute
        left:.2rem
        top:.2rem
        width:.8rem
        height:.8rem
        text-align :center
        line-height :.8rem
        border-radius:.4rem
        background :rgba(0,0,0,.8)
        .header-abs-back
            color :#fff
            font-size :.4rem
    .header-fixed
        z-index:2
        position :fixed
        top:0
        left:0
        right:0
        overflow:hidden
        height :.86rem
        line-height :.86rem
        text-align :center
        color :#fff
        background :$bgColor
        .header-fixed-back
            position:absolute
            top:0
            left:0
            width:.64rem
            font-size:.4rem
            color:#fff

 
</style>
